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The material or substance on which an enzyme acts.
(noun)
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Biology A surface on which an organism grows or is attached.
(noun)
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An underlying layer; a substratum.
(noun)
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Linguistics An indigenous language that contributes features to the language of an invading people who impose their language on the indigenous population.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.